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The ratings of three Service stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

StoneMor Partners (NYSE:STON) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. StoneMor Partners owns and operates the assets and businesses previously owned and operated by Cornerstone Family Services. For Portfolio Grader’s specific subcategory of Earnings Growth, STON also gets an F. The stock price has dropped 7.6% over the past month, worse than the 3.2% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of STON stock.

Matthews International (NASDAQ:MATW) ratings are on the decline this week as the company earns a F (“strong sell”). Last week, it received a D (“sell”). Matthews International is a designer, manufacturer and marketer principally of memorialization products and brand solutions. Memorialization products consist primarily of bronze memorials and other memorialization products, caskets and cremation equipment for the cemetery and funeral home industries. To get an in-depth look at MATW, get Portfolio Grader’s complete analysis of MATW stock.

The rating of Corinthian Colleges (NASDAQ:COCO) declines this week from a C to a D. Corinthian Colleges is a post-secondary education company in North America. The stock gets F’s in Earnings Momentum and Earnings Revisions. Investors seem to agree with the downgrade and have pushed down the share price 15.5% over the past month. As of Nov. 21, 2012, 26.1% of outstanding Corinthian Colleges shares were held short. The stock currently has a trailing PE Ratio of 218.00. For a full analysis of COCO stock, visit Portfolio Grader.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.